A bistable brake

Abstract

The utility model discloses a kind of bistable brake, belong to electromagnetic brake technical field, including spline rotor, moving plate and stator, the stator includes yoke and the coil of annular arrangement in yoke, permanent magnet and inner magnet, the moving plate and yoke are connected by compression spring, the permanent magnet and inner magnet are located at the side close to moving plate and form air gap between moving plate, the magnetic pole direction of permanent magnet is the radial direction of brake, and multiple the inner magnet is arranged in the inner ring of permanent magnet in block.This utility model permanent magnet magnetic pole direction is the radial direction of brake, realize the permanent magnet generated magnetic field to the permanent magnet force of moving plate under the air gap change of moving plate and yoke changes quickly;While installing inner magnet in block, reduce the machining precision of inner magnet, reduce the magnetic path loss of permanent magnet.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic brake technology, and in particular relates to a bistable brake. Background Technology

[0002] An electromagnetic brake is a connector that transmits torque from the active side to the passive side. It can be freely engaged, disengaged, or braked as needed. It features a compact structure, simple operation, sensitive response, long service life, reliable use, and ease of remote control. Conventional electromagnetic brakes achieve braking by generating electromagnetic force through continuous energization, and release the brake by spring force when the power is off. However, their braking torque is proportional to the current intensity, requiring continuous energy consumption to maintain the braking state. Bistable electromagnetic brakes, on the other hand, differ from traditional electromagnetic brakes in that they utilize permanent magnets or remanent magnetization to maintain a stable state, allowing them to maintain braking or release without continuous power supply.

[0003] However, in existing bistable brakes, the magnetic poles of the permanent magnets are oriented along the brake's axial direction. The magnetic field generated by the permanent magnets exerts insufficient sensitivity on the moving plate due to changes in the air gap between the moving plate and the yoke, resulting in slow changes. Furthermore, the internal magnets in existing brakes are all installed as a single piece. During installation, the outer surface of the inner magnet needs to fit as closely as possible to the inner surface of the permanent magnet, thus requiring high precision in the machining of the internal magnets and high concentricity during installation, which is detrimental to manufacturing.

[0004] Therefore, the inventors have provided a new bistable brake to solve the aforementioned technical instability problem. Utility Model Content

[0005] The purpose of this invention is to provide a bistable brake to solve the problems existing in the prior art.

[0006] The objective of this utility model is achieved through the following technical solution: A bistable brake includes a splined rotor, a moving plate, and a stator. The stator includes a yoke and coils, permanent magnets, and inner magnets arranged in a ring within the yoke. The moving plate and the yoke are connected by a compression spring. The permanent magnets and inner magnets are located on the side closer to the moving plate and form an air gap with the moving plate. The magnetic pole direction of the permanent magnets is radial to the brake. Multiple inner magnets are arranged in blocks within the inner ring of the permanent magnets.

[0007] Furthermore, a wedge-shaped magnetic shielding block is provided on the inner side of the inner magnet, and the inner side of the inner magnet is connected to the inclined surface of the wedge-shaped magnetic shielding block.

[0008] Furthermore, a limiting step is provided on the side of the permanent magnet near the inner magnet.

[0009] Furthermore, the compression spring is located on the outside of the permanent magnet.

[0010] Furthermore, the coil is located on the side of the inner magnet away from the moving plate, and potting compound is provided between the coil, the inner magnet, and the permanent magnet.

[0011] Furthermore, the moving plate is located between the spline rotor and the stator and is sleeved on the spline rotor.

[0012] Furthermore, the spline rotor has a flange on the side away from the moving plate, and the flange is connected to the stator screw.

[0013] The beneficial effects of this utility model are: 1) The magnetic pole direction of the permanent magnet is the radial direction of the brake. The permanent magnetic force of the magnetic field generated by the permanent magnet on the moving plate changes rapidly with the change of the air gap between the moving plate and the yoke. The permanent magnetic force is very large when the air gap is zero, and the permanent magnetic force is particularly small when the air gap is maximum.

[0014] 2) Installing the inner magnet in sections reduces the machining precision of the inner magnet. At the same time, the area of ​​the inner magnet is reduced, and the magnetic circuit loss of the permanent magnet is also reduced, thus ensuring the permanent magnet force. Attached Figure Description

[0015] Figure 1 This is a top view of a bistable brake according to the present invention; Figure 2 for Figure 1 Sectional view at point AA; Figure 3 This is a schematic diagram of the modular installation of the internal magnet. In the diagram, 1-flange, 2-spline rotor, 3-moving plate, 4-magnetic yoke, 5-coil, 6-potting compound, 7-permanent magnet, 8-inner magnet, 9-wedge-shaped magnetic isolation block, 10-compression spring, 11-limiting step. Detailed Implementation

[0016] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] See Figures 1-3 This utility model provides a technical solution: like Figures 1-3As shown, a bistable brake includes a splined rotor 2, a moving plate 3, and a stator. The stator includes a magnetic yoke 4 and coils 5, permanent magnets 7, and inner magnets 8 arranged in a ring within the magnetic yoke 4. The moving plate 3 and the magnetic yoke 4 are connected by a compression spring 10. The permanent magnets 7 and inner magnets 8 are located on the side closer to the moving plate 3 and form an air gap with the moving plate 3. Its braking principle is as follows: When the brake is applied, the air gap between the moving plate 3 and the magnetic yoke 4 is at its maximum. At this time, the spring force of the compression spring 10 is much greater than the permanent magnetic force of the permanent magnet 7, thus maintaining the braking state of the brake. Simultaneously, the moving plate 3 generates a corresponding positive pressure on the spline rotor 2, achieving a certain amount of static torque. When the coil 5 is forward energized, the electromagnetic force generated by the inner magnet 8 assists the permanent magnetic force generated by the permanent magnet 7 in overcoming the spring force of the compression spring 10, thus unlocking the brake. When the brake is unlocked, the air gap between the moving plate 3 and the magnetic yoke 4 is close to 0. At this time, the permanent magnetic force of the permanent magnet 7 is much greater than the spring force of the compression spring 10, thus maintaining the unlocked state of the brake. When the coil 5 is energized in the reverse direction, the electromagnetic force of the inner magnet 8 cancels the permanent magnetic force. When the resultant force is less than the spring force of the spring, the moving plate 3 is released, thereby braking.

[0018] In this embodiment, the magnetic pole direction of the permanent magnet 7 is radial to the brake, rather than conventionally arranged along the axial direction of the brake. The purpose of this is to make the permanent magnetic force of the magnetic field generated by the permanent magnet 7 on the moving plate 3 change rapidly with the change of the air gap between the moving plate 3 and the magnetic yoke 4, so that the permanent magnetic force is very large at zero air gap and particularly small at maximum air gap. Compared with the conventional installation of permanent magnet 7 with axial magnetic poles, this is helpful for the design and manufacture of this bistable brake.

[0019] Meanwhile, in this embodiment, multiple inner magnets 8 are arranged in blocks within the inner ring of the permanent magnet 7.

[0020] Previously, the inner magnet 8 was installed as a single piece, requiring its outer surface to fit as closely as possible to the inner surface of the permanent magnet 7. This placed high demands on the machining precision and concentricity of the inner magnet 8. The current modular installation reduces both the precision requirements and the installation difficulty. Furthermore, this method reduces the area of ​​the inner magnet 8, thereby decreasing the magnetic circuit loss of the permanent magnet 7 and ensuring the permanent magnet force.

[0021] Furthermore, a wedge-shaped magnetic shielding block 9 is provided on the inner side of the inner magnet 8, and the inner side of the inner magnet 8 is connected to the inclined surface of the wedge-shaped magnetic shielding block 9.

[0022] Through the above technical solution, the wedge-shaped magnetic shielding block 9 cuts off contact with the iron core of the yoke 4, and the electromagnetic force does not need to pass through the inner magnet 8, reducing electromagnetic losses and enhancing the independence of the electromagnetic magnetic field. Furthermore, the wedge-shaped magnetic shielding block 9 is installed after the inner magnet 8 is installed, and the inclined surface of the wedge-shaped magnetic shielding block 9 limits the inner magnet 8, facilitating installation and positioning.

[0023] Furthermore, a limiting step 11 is provided on the side of the permanent magnet 7 near the inner magnet 8.

[0024] like Figure 2 As shown in the enlarged schematic diagram and the book, after the permanent magnet 7 is installed, the inner magnet 8 is installed in sections. The limiting step 11 of the inner magnet 8 can prevent the permanent magnet 7 from coming out.

[0025] Furthermore, the compression spring 10 is located outside the permanent magnet 7, and provides spring force to the moving plate 3 through the compression spring 10.

[0026] Furthermore, the coil 5 is located on the side of the inner magnet 8 away from the moving plate 3, and potting compound 6 is provided between the coil 5, the inner magnet 8 and the permanent magnet 7.

[0027] Through the above technical solution, the potting compound 6 is used to connect the coil 5 and the inner magnet 8, and at the same time serves a sealing function.

[0028] Furthermore, the moving plate 3 is located between the spline rotor 2 and the stator and is sleeved on the spline rotor 2.

[0029] Furthermore, a flange 1 is provided on the side of the spline rotor 2 away from the moving plate 3, and the flange 1 is connected to the stator screw.

[0030] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A bistable brake, comprising a splined rotor (2), a moving plate (3), and a stator, characterized in that: The stator includes a magnetic yoke (4) and coils (5), permanent magnets (7) and inner magnets (8) arranged in a ring inside the magnetic yoke (4). The moving plate (3) and the magnetic yoke (4) are connected by a compression spring (10). The permanent magnets (7) and inner magnets (8) are located on the side close to the moving plate (3) and form an air gap with the moving plate (3). The magnetic pole direction of the permanent magnets (7) is radial to the brake. Multiple inner magnets (8) are arranged in blocks in the inner ring of the permanent magnets (7).

2. The bistable brake according to claim 1, characterized in that: The inner magnet (8) has a wedge-shaped magnetic shielding block (9) on its inner side, and the inner side of the inner magnet (8) is connected to the inclined surface of the wedge-shaped magnetic shielding block (9).

3. The bistable brake according to claim 1, characterized in that: The permanent magnet (7) has a limiting step (11) on the side near the inner magnet (8).

4. The bistable brake according to claim 1, characterized in that: The compression spring (10) is located outside the permanent magnet (7).

5. The bistable brake according to claim 1, characterized in that: The coil (5) is located on the side of the inner magnet (8) away from the moving plate (3), and potting compound (6) is provided between the coil (5), the inner magnet (8) and the permanent magnet (7).

6. The bistable brake according to claim 1, characterized in that: The moving plate (3) is located between the spline rotor (2) and the stator and is sleeved on the spline rotor (2).

7. The bistable brake according to claim 1, characterized in that: The spline rotor (2) has a flange (1) on the side away from the moving plate (3), and the flange (1) is connected to the stator screw.

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